Measured environments within 20 meters of the strike points of triggered lightning
Vertical electric fields, azimuthal magnetic fields, and earth voltages developed over 0.5-m radial step distances have been measured at 10 and 20 m from the ground attachment point of triggered lightning. The magnetic fields are found to follow Ampere`s law closely. The relationship between maximum vertical electric field change due to a descending dart leader and the peak of its associated return-stroke current is linear. Recorded earth step voltages have the same waveforms as the incident return-stroke currents, and, for distances between 10 and 20 m from the strike point, their amplitudes exhibit a 1/r dependence. Statistics are given for observed radial filamentary arcing from the ground attachment point.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Department of the Army, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 100143
- Report Number(s):
- SAND-95-0353C; CONF-9509199-2; ON: DE95016093; TRN: 95:006601
- Resource Relation:
- Conference: International aerospace and ground conference on lightning and static electricity, Williamsburg, VA (United States), 26-28 Sep 1995; Other Information: PBD: 1995
- Country of Publication:
- United States
- Language:
- English
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